The Bridge Project is underway in Nijmegen, built by BAM and Weber Beamix is debated by Davide Sher. It could have well been a proper infrastructural operation for any country of the MENA region, were it not for all socio-economical factors. In effect, this Longest 3D printed concrete pedestrian bridge could be the answer to a multitude of requirements.
Longest 3D printed concrete pedestrian bridge begins to take form
March 30, 2021
The world’s longest 3D printed concrete pedestrian bridge, co-commissioned by Rijkswaterstaat (Dutch Directorate-General for Public Works and Water Management), is being built in Dukenburg in the city of Nijmegen, Netherlands, and printed in Eindhoven, where the 3D printing facility of BAM and Weber Beamix is located. Summum Engineering was responsible for the parametric modeling, in order to elaborate and rationalize the freeform geometry, designed by Michiel van der Kley.
This project, also dubbed “The Bridge Project”, is an initiative of Rijkswaterstaat, Michiel van der Kley in collaboration with Eindhoven University of Technology (TU/e), and an effort to innovate, apply new techniques in the building environment, specifically the 3D printing of concrete, and to find new ways to collaborate.
While looking for a location, Nijmegen seemed an ideal place, following the city’s position as Green Capital of Europe in 2018, and their wish to have an eye-catching and iconic memento of that year. Rijkswaterstaat believes it is not only building a bridge but building the future as well, turning 3D concrete printing from innovation to proven technology.
The longest 3D printed bridge in the world, soon be installed in Nijmegen, is now in full swing and four more bridges for North Holland are in the pipeline at Weber Beamix. Sometimes it may seem that 3D printing is used only mainly for aesthetic display projects but the truth that is increasingly emerging is that printed objects have been finding their way to more practical applications, and a very large market is rapidly developing, all over the world, with huge projects now underway all over Europe, in the US, in Africa, in the Middle East, in China and in Australia.
Digital design and construction are expected to lead to new concepts for building, with lower risks and better conditions. 3D printing technology has the potential for more affordable, faster, durable and freeform methods of construction. Rijkswaterstaat and Michiel van der Kley were intent on exploring designs that are almost impossible to make with traditional techniques involving formworks, to find out whether or not 3D printing allows for much greater design freedom, and other benefits as well. A first test bridge was produced by TU/e, and the final bridge will be printed and assembled by BAM, using the joint printing facility set up with Weber Beamix.
The possibilities of freeform construction with 3D printing also lead to new challenges, such as the approach to structural safety, the method of analysis for such shapes, and determining the input for the 3D printer. In order to elaborate and rationalize the freeform design, Summum Engineering was commissioned by the structural engineers, Witteveen+Bos, to create a parametric model.
This model took the initial shape, conformed it to structural constraints set by the engineers, segmented it based on printing specifications from TU/e, and then generated the bridge’s internal geometry. Three types of outputs were determined: first, exterior surfaces of the segmented bridge as input to the Revit-model and 2D drawings by Witteveen+Bos; second, meshes, including of the internal geometry, as input to their finite element calculations in DIANA; and, third, printing paths for the 3D printers of TU/e, and later BAM and Weber Beamix, based on their printing specifications.
Since 2002, Davide has built up extensive experience as a technology journalist, market analyst and consultant for the additive manufacturing industry. Born in Milan, Italy, he spent 12 years in the United States, where he completed his studies at SUNY USB. As a journalist covering the tech and videogame industry for over 10 years, he began covering the AM industry in 2013, first as an international journalist and subsequently as a market analyst, focusing on the additive manufacturing industry and relative vertical markets. In 2016 he co-founded London-based 3dpbm. Today the company publishes the leading news and insights websites 3D Printing Media Network and Replicatore, as well as 3D Printing Business Directory, the largest global directory of companies in the additive manufacturing industry.
Few construction industry leaders would say they oppose data integration. Most acknowledge that combining different data types and formats into a central location allows access to complete, current and accurate information to help them make fact-based decisions instead of acting on hunches. So why doesn’t every engineering and construction (E&C) firm have a warehouse of integrated data? The culprit is often misinformation created by myths about data integration. We will debunk three of the biggest myths about costs, downtime, and complexity below.
Myth #1: Data integration cannot be achieved without high costs
This myth was once true, and some vendors still do quote integration approaches that are not feasible for many E&C firm budgets. But today, integration solutions once available only to enterprises atop the ENR 500 are now available to small and mid-sized firms. Recent breakthroughs in virtualization, iPaaS, and cloud computing have contributed to their lower costs and broader availability.
As defined by Tech Target, data virtualization is an approach to data management that allows an application to retrieve and manipulate data without requiring technical details, like data format or its physical location. As this technology has matured, it has driven total integration costs down.
Integration Platform as a Solution (iPaaS)
Gartner defines iPaaS as a suite of cloud services enabling development, execution, and governance of integration flows connecting any combination of on-prem and cloud-based processes, services, applications, and data within individual or across multiple organizations.
iPaaS is ideal for E&C firms. Collaborating and sharing information across multidisciplinary teams including owners, architects, consultants, engineers, contractors, subcontractors, and suppliers using different systems is the cornerstone of E&C work.
Construction organizations typically collaborate with teams across multiple cloud platforms, so when considering iPaaS, look for a cloud-agnostic solution. Some solutions offer packages with varying costs based on the number and/or complexity of flows (data sources) needed. Custom email alerts may also prove helpful, for example, if an error occurs or if a batch is completed.
Collecting servers in a single room or rack is no longer necessary. Geographic isolation of data sources is actually a business continuity / disaster recovery best practice. Amazon Web Services, Microsoft Azure, and Google Cloud were growing in popularity even prior to the COVID-19 pandemic. The sharp increase of remote work and video conferencing accelerated their growth.
E&C firms are deploying more hybrid-cloud and multi-cloud arrangements. Essentially, hybrid cloud refers to the combination of private and public cloud infrastructure, and some or many from an organization’s own data center. Multi-cloud configurations use multiple cloud providers to meet different technical or business requirements. The reason cloud computing, sometimes referred to as infrastructure as a service (IaaS), is so popular is that it allows for fast scalability, broad availability, and low total cost of ownership vs. managing everything in company-owned data centers.
Myth #2: Data integration requires significant downtime
Even during off-peak times, E&C firms want to avoid downtime. Today’s data integration solutions offer rapid time to value with development-cycle times reduced by as much as 33%. Some solutions may be able to eliminate workday downtime with only brief downtime on evenings and weekends.
Containerization, enabling developers to create predictable environments isolated from other applications, is also used by some solutions. With containerization, consistency is guaranteed regardless of where an application is deployed. Containers only use about 60 lines of code so they can be developed and deployed quickly to minimize downtime.
Myth #3: Managing a data warehouse is complicated
What is involved with keeping a data integration platform running?
The short answer is that it depends, but there are solutions that do not require a high degree of information technology (IT) overhead. Look for solutions that include intuitive dashboards to monitor and troubleshoot integrations, the ability to quickly review flows, rerun flows on demand, or view error details, if any.
If using iPaaS, consider a solution that includes a dedicated client-success (CS) manager. The CS manager puts an iPaaS subject-matter expert on your company team, instantly adding value while eliminating the learning curve for an existing team member to become proficient. And unlike a consulting relationship where the expert stays for a while to train your team but then leaves, a client-success manager is always available to create or troubleshoot flows.
Today’s construction and engineering world requires unprecedented external collaboration, with multiple parties outside your organization at every building, site, and external site. The mobile information, in turn, reduces data centralization, creating a greater urgency to adopt a data integration solution.
Want to learn more? Gaea Global Technologies, Inc. has decades of experience with construction and engineering solutions. Nexus, Gaea’s integration-platform-as-a-service (iPaaS) solution, was designed to automate construction processes across applications.
Hager Harabech elaborates in Phys.Org how Amid Nile dam tensions, Egypt recalls Aswan 50 years on.
13 January 2021
Half a century since Egypt’s ground-breaking Aswan dam was inaugurated with much fanfare, harnessing the Nile for hydropower and irrigation, the giant barrier is still criticised for its human and environmental toll.
It is also a stark reminder—amid high tensions today as Addis Ababa fills its colossal Grand Ethiopian Renaissance Dam (GERD) upstream—of just how volatile politics over the life-giving, but finite, Nile water resources can be.
The Aswan High Dam was spearheaded in the early 1950s by charismatic pan-Arabist president Gamal Abdel Nasser.
Egypt, where the river provides some 97 percent of water for more than 100 million people, is the final section of the Nile’s 6,650-kilometre (4,130-mile), 10-nation journey to the Mediterranean.
For millennia, the North African country was at the mercy of the seasonal rise and fall of the river, dependent on the rainfall in nations far upstream.
But the 111-metre-high and 3.6-kilometre-wide Aswan High Dam, dwarfing the far smaller Aswan Low Dam built under British rule in 1902, crucially gave Cairo power to regulate the flow.
It was a “very important hydro-political act”, said geographer and author Habib Ayeb, a Nile expert who has taught at universities in Cairo and Paris.
The dam was inaugurated on January 15, 1971, three months after Nasser’s death, by his successor Anwar al-Sadat.
For the first time, “an Egyptian president decided to manage the Nile within Egypt”, to develop agriculture and the economy in the country, Ayeb added.
For Egypt, an otherwise desert nation where 97 percent of the population lives along the green and fertile Nile banks, the dam revolutionised its relationship with the land.
“The dam offered a reprieve to Egyptians by giving them enough water… and protecting them from the hazards of floods, which could be absolutely catastrophic,” said Ayeb.
It also brought electricity to much of the country, a move Nasser said was key to developing the nation.
Abdel Hakim Hassanein, who overlooks the river from his home close to the dam, some 700 kilometres south of Cairo, praised its construction.
“We didn’t have electricity before, we used oil lamps,” the 68-year-old said, adding that work at the dem remains a key source of local jobs.
Ethiopia, the second most populous nation in Africa, today uses similar arguments, saying its 145-metre (475-foot) GERD Blue Nile barrier—set to be Africa’s largest hydro-electric dam—is vital to provide power for its 110 million people.
But Egypt, with the Arab world’s largest population, sees the GERD as an existential threat.
‘Belly of the desert’
In the 1960s, many Egyptians also saw the Aswan dam as a threat to their lives—in a different way.
The lake behind the dam flooded the homeland of Egypt’s Nubian people, forcing tens of thousands to leave.
“For the Nubians, the High Dam is a symbol of oppression,” said rights activist Fawzi Gayer. “It wiped out a civilisation.”
Gayer was born just after his family was relocated to a dusty town its Nubian residents call Abu Simbel “Displacement”.
“We’re talking about a community with a Nilotic identity that breathes the Nile… and we have been thrown into the belly of the desert,” said Gayer.
“The elderly died of shock.”
The Nubians’ long-running demand for a “right of return” was included in the 2014 constitution, but their lands have been swallowed by the 355-kilometre-long Lake Nasser, which stretches south into Sudan.
It was not only people who had to move; the waters threatened to drown the three-millenium-old Pharaonic temples at Abu Simbel, kickstarting a massive UNESCO-led rescue mission that took eight years.
The ancient complex, including giant stone carved statues, was dismantled and moved to a new location, in one of the world’s biggest archaeological rescue operations.
There were environmental consequences too.
The creation of the giant lake also upset the river’s delicate ecosystem, holding back the fertile silt deposits, causing erosion and increasing use of chemical fertilisers.
For Ayeb, the dam also “proved to be a political bomb”.
In building Aswan, Egypt and Sudan agreed a Nile water sharing deal, but did not include any other upstream nations, including Ethiopia.
“It created the foundations for the break-up of the Nile basin as a framework for a common good,” said Ayeb.
Today, Addis Ababa, Cairo and Khartoum are mired in long-running fractious talks over the filling and operation of the GERD dam.
But, according to Ayeb, the critical challenge for Egypt is the management of the water it gets at present.
“Even if Ethiopia stopped its dam, there wouldn’t be enough water,” he said, arguing Egypt should halt desert irrigation—where nearly half the water is lost by evaporation—and stop agricultural exports.
Ayeb believes Cairo needs a new water and agricultural policy entirely.
Welcome to the year that follows the most turbulent year that all countries and sectors of their socio-economic went through. Here is the 2021 outlook: 6 trends that will influence construction this year.
Several factors – some positive, some less so – are poised to shape the industry this year.
Here’s some perspective to ring in the new year: “2020 bad, 2021 good.”
That’s the takeaway from construction observers looking ahead at the turn of the year, even as the bleakness of the pandemic surge and record deaths in the U.S. continue to weigh on their minds.
“My expectation is that the U.S. economy will shrink between 4% and 5% in 2020,” said Anirban Basu, chief economist at the Associated Builders and Contractors during a year-end webinar, where he also made the good-bad prognostication quoted above. “But we’re going to come back hard in 2021.”
There are reasons for hope, such as a second coronavirus vaccine being authorized for emergency use and shipped in recent weeks and the $900 billion relief package recently signed by President Trump. But the drivers of optimism among those who track construction are also more specific to the space, while encompassing fundamental shifts in markets and processes that will lead to more broad-based development activity in 2021.
Just listen to Tom Stringer, managing director for site selection and business incentives at professional services firm BDO, whose job is to find suitable development sites for corporate clients who want to build new facilities and offices.
“Site selection tends to be a leading indicator in the economy that businesses are starting to think about capital investments, and our phones have been ringing,” Stringer said. “So if your readers are the folks on the contracting side, well, they’re about to get busy, too.”
Stringer isn’t alone. According to a post-election survey of engineering and construction executives conducted by Deloitte, 68% of respondents characterized the business outlook for the industry as somewhat or very positive.
“We do see pent-up demand sitting out there as we end out 2020 and come into 2021,” said Michelle Meisels, Deloitte’s engineering and construction practice leader.
That widespread optimism among construction executives is grounded in the reality of several factors – some positive, some less so – that are poised to shape construction in 2021. Here are six of the top factors that will influence the industry in the new year:
Subs on the skids
The coming months and beyond could be particularly hard on subcontractors, and the contractors who will need them once projects pick up again.
“The market is just getting much more competitive for subcontractors, and therefore, sadly, some will go out of business, especially the smaller guys,” Meisels said. “General contractors may need to self-perform a lot of work they would normally sub out, and build those capabilities in house.”
That’s the road Michael Bordes, president of New York City general contractor AA Jedson Company, is already on.
He said during the pandemic, he’s had to pivot from the restaurants and gyms he built previously to focus on affordable housing projects that were still considered essential. But he’s also flipping the script and limiting his risk from subs by handling more work in house.
“We’re self-performing most of the construction tasks ourselves because the subcontractors that are out there are having a very hard time,” said Bordes, noting that affording insurance is one issue subs are struggling with. “The people we’re dealing with may not be transparent about saying we’re having trouble with assurances or we’re short on labor. If you keep it on your payroll, you at least have 95% control.”
Meanwhile, Bordes said he’s focused on keeping his workers safe and healthy by combating complacency and continually reinforcing mitigation strategies, which has become more challenging as the pandemic has worn on. And while he hopes his workers will sign up to get the vaccine, he says he’s not planning to force them to do so if they have reservations about taking it.
“We know masks work. We know sanitizing on a regular basis, washing your hands and not touching your face works to not get this disease,” Bordes said. “But while we would suggest to employees that it’s important to get the vaccine, we don’t feel we can force them. Some are still cautious about what the side effects might be in the future.”
With subs being squeezed, contractors will also surely be challenged to hire enough workers, even in house, when the pent-up demand of mothballed projects are put back into the marketplace once the pandemic is brought under control. At the same time, observers say companies aren’t doing so yet, since many new projects still aren’t coming to market, given the explosion of coronavirus cases going into 2021.
“The story there is that projects are still getting pushed to the right, so companies are not hiring unless they have a job to put someone on,” said Patrick Jones, who leads the architecture, engineering and construction division at Raleigh, North Carolina-based recruiting firm Orion Talent. “They’re not just out there building bench strength.”
He says while experienced superintendents and estimators are still in high demand, companies don’t necessarily want to hire individuals they would have to train and invest in while jobs are still scarce. “We see that hiring for what I would call the entry level roles has slowed,” Jones said.
At the same time, nonresidential construction has only regained 58% of the jobs it lost since the beginning of the pandemic, according to Ken Simonson, chief economist for the Associated General Contractors of America. In November, he noted, the industry’s unemployment rate was 7.3%, not seasonally adjusted, with 732,000 former construction workers idled.
On its surface, that may indicate contractors will have
an easier time hiring coming out of the pandemic. But that’s still not likely to be the case, according to Basu.
During his economic forecast in December, Basu asked his audience of more than 1,000 participants how many intended to increase staffing in the coming year, with more than half responding affirmatively. That’s in line with the ABC’s Construction Confidence Index from November, which indicated a majority of firms intended to increase staffing in the next six months.
Given the demand for projects, along with many firms trying to hire workers whenever jobs are finally released in 2021, contractors may experience labor challenges all over again.
“I would predict that many of you will continue to suffer difficulty finding truly motivated and skilled workers,” Basu told his contractor audience. “One thing that has happened in past recessions is that many construction workers who lost their jobs left the construction industry altogether.”
Infrastructure on the agenda
On the bright side, there should be some increased infrastructure and building projects on the horizon.
This is especially true with President-elect Joe Biden pushing his Build Back Better initiative, which is envisioned as a broad spending program that could benefit contractors on multiple fronts.
“He’s looking for a multitrillion-dollar infrastructure bill that includes a broad definition of infrastructure, whether it’s surface transportation, aviation, waterfront, Army Corps, civil works, flood control mitigation projects, clean drinking water, renewable energy projects, K-12 public school construction or broadband,” said Jimmy Christianson, vice president of government relations at AGC. “There’s a lot in there.”
Meisels also sees opportunity for contractors under that kind of program in 2021.
“Infrastructure and public utility projects could possibly see a sharp rebound,” Meisels said. “If the administration comes through and directs funds toward that, you’d see projects that are driven by this government spending.”
Office, manufacturing, distribution projects ahead
Part of that jump-start may already be happening on the private side. Take the activity Stringer, the site selection executive, has been seeing lately.
His clients are calling and expressing interest in expanding offices in tertiary markets away from where their headquarters are in densely populated cities. But they’re also looking to build manufacturing and distribution facilities, to help alleviate some of the vulnerabilities the pandemic brought to light in the just-in-time supply chain.
“The supply chain issues that were rampant during the start of the crisis really presented significant business opportunities for the unsexy old ways of things like inventory and building warehouses,” Stringer said. “Hopefully, we’ll never be without toilet paper again.”
Indeed, the explosion of e-commerce has caused a boom in the sector. “The most obvious change of the year has been robust development of warehouse and distribution facilities to meet the sudden rise in e-commerce,” said Robert Smietana, CEO at Chicago-based industrial developer and consultant HSA Commercial Real Estate.
For example, CRG, the real estate development and investment arm of Chicago-based Clayco, plans to identify industrial development and acquisition opportunities in cities such as Atlanta, Chicago, Philadelphia, St. Louis and Columbus, Ohio.
“It’s no secret that e-commerce has been a tailwind to industrial real estate over the last cycle,” said Kevin Scott, vice president of investments and developments for CRG. “But e-commerce users still represent just a fragment of the overall industrial user base. Specialized uses such as cold storage and data centers continue to grow, and we are excited about opportunities there.”
Renewed focus on the environment
Data center construction is one of two top-growth industries for Jones, the construction recruiter, to find specialty contractors. The other? Utility-scale solar.
“Big players in utility-scale solar have been on a growth pattern, and are really kind of hitting their stride in this next year,” Jones said. “Obviously, the new administration would be beneficial to that as well.”
For example, Fort Lauderdale, Florida-based Moss Construction highlights several of the utility-scale solar installations it has worked on in recent years in its portfolio, and promotes on its website that it is “helping our nation move towards a cleaner energy future.”
“The construction industry is under tremendous pressure to improve their energy use,” said Meisels. “But I also think that construction companies that build capabilities to support green building standards and sustainable efforts by their clients are going to be positioned to thrive. You can’t not address this if you want to be a leader in this space.”
The Region is wrestling with oil demand slowdown but construction recovery is predicted for 2021 and 2022, GlobalData report as per Dominic Ellis of Construction Global who elaborates on the MENA construction output growth forecast sees 4.5% drop.
18 December 2020
Region wrestling with oil demand slowdown but construction recovery predicted for 2021 and 2022, GlobalData report says
The construction output growth forecast for the Middle East and North Africa (MENA) region for 2020 predicts a contraction of 4.5 percent this year, before a recovery with growth of 1.9 percent in 2021, and 4.1 percent in 2022, according to GlobalData.
The region is wrestling with two distinct but related issues: climate change, and the slowdown in oil demand.
The data and analytics company reports that the 2020 contraction reflects the severe impact of COVID-19 lockdowns, as well as other restrictions on construction activity. Much will depend on its ability to embrace digital transformation.
Yasmine Ghozzi, economist at GlobalData, said: “The construction sector will face headwinds in 2021 with a slow recovery, but the pace of recovery will be uneven across countries in the region. Throughout 2020, and running to 2021, spending on real estate megaprojects, especially in the GCC, is likely to take a backseat as a result of budget revisions.
“However, large-scale projects in the oil, gas, power and water sectors have gained traction against the downturn in market conditions this year, and this is likely to continue. As a result, some local contractors are pursuing development in these sectors to replace the loss of real estate work.
“There is also a push towards decoupling power and water production across the region to reduce energy consumption continuing to provide the impetus for Independent Water Projects (IWP) implementation and in the future, there will be a lot of contract awards in that respect as the region pushes its renewable energy programme, particularly solar photovoltaic and wind.”
GlobalData has slightly revised up its forecast for Saudi Arabia’s construction output to -1.9 percent from -2.8 percent and expects a recovery for the sector of 3.3 percent in 2021. This revision reflects an improvement in economic performance and the Kingdom ending a nationwide curfew at the end of September, lifting restrictions on businesses after three months of stringent curbs and a notable decrease in infection rate.
Recovery is also underlined by the crown prince’s announcement in mid-November that the Public Investment Fund (PIF) is to invest £29.5 billion (5% of GDP per annum) in the economy in 2021-22.
Nearly half of the construction of the five minarets of the Grand Mosque in Makkah is now complete.
GlobalData still maintains its forecast for construction output growth in the UAE of -4.8 percent, with a rebound in 2021 of 3.1 percent and a promising medium-term outlook.
Ghozzi adds: “The recent approval of a new Dubai Building Code is a positive development for the UAE. The new code outlines a revised set of construction rules and standards and seeks to reduce construction costs by streamlining building rules.”
The UAE is proceeding with plans to expand its production capacity with Abu Dhabi National Oil Company (ADNOC) announcing its five-year investment plan worth £90.1 billion.
Qatar, Kuwait, and Oman
GlobalData has not changed its estimated growth rates for Qatar and Kuwait in 2020, at -4.5 percent and -9.5 percent, respectively. However, it has further cut the growth forecast for Oman to -10.3 percent from an earlier estimate of -8.1 percent, as the construction industry struggles with the challenges presented by the outbreak of COVID-19, low oil prices and the impact of sovereign credit rating downgrades.
Ghozzi adds: “The new fiscal plan launched by the Omani Government to wean itself off its dependence on crude revenues through a series of projects and tax reforms is a good step which will aid the construction sector recovery in the medium term”.
GlobalData expects construction in Egypt to grow at 7.7 percent in 2020, slowing from 9.5 percent in 2019 – given a short-term slow down due to the pandemic – and 8.9 percent in 2021. The industry is also expected to continue to maintain a positive trend throughout the forecast period.
Ghozzi continues: “Egypt has become the first sovereign nation in the MENA region to issue green bonds with a £553.9 million issuance. Bonds’ earnings will be used to fund projects that meet Egypt’s commitment to the UN goals for sustainable development.”
Egypt’s comprehensive development plan provides varied opportunities for construction companies, such as the national project to develop the countryside which targets 1,000 villages nationwide.
GlobalData expects Israel’s construction industry to contract by 8.9 percent in 2020, reflecting the significant fallout from the pandemic, with growth expected to resume at a modest pace in 2021.
Ghozzi said containing a second wave of the virus, while trying to revive the economy and approve budgets for 2020 and 2021, are the government’s top priorities. “However, difficult decisions will be postponed, with the deadline to pass the 2020 budget being pushed to the end of 2020,” he said.
In the Arab Maghreb, GlobalData maintained its forecasts for construction growth in 2020 for Morocco and Algeria to -5.5, and -3.4 percent, respectively.
Ghozzi adds: “Amid a second wave of COVID-19 with restrictions placed on public mobility along with increasing public sector doubt about economic prospects and social tensions continuing to cause shutdowns at oil and phosphate-manufacturing facilities, GlobalData has further cut its forecast for Tunisia to -13.3 percent from an earlier estimate of -12.5 percent.
“Recovery in the sector is expected to be very slow and expectation of an early legislative election is likely in 2021 but is unlikely to reduce political volatility.”
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Earth has been used as a building material for at least the last 12,000 years. Ethnographic research into earth being used as an element of Aboriginal architecture in Australia suggests its use probably goes back much further.
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